Thankfully round here the price difference (according to petrol prices) is 7p/litre at the local Sainsbury’s.
This is what my manual says
OCTANE
RON 95 can be used for normal driving.
RON 98 is recommended for good power and low fuel consumption.
An octane rating lower than RON 95 must not be used.
It also says E5 and E10 are permitted and the following,
Only use petrol from well-known producers. Never use fuel of dubious quality. The petrol must fulfil the EN 228 standard.
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